[Freeswitch-users] Simultaneous ring of all phones registered with the same extension number

Hi, Could not find this answer, so would appreciate any hints. I have registered 2 sip phones using the *same *extension number. When I dial this extension number, only one sip phone rings. However I need both of them to start ringing. Is it possible, that when I dial the number - both other phones will ring, not only one..? And when I answer on a phone, another one would stop ringing. Thank you, Vitalie